The PubMed and Ovid databases were searched using the mesh term "heart rate variability" and: "short""term""short-term" and "five." A second search using 13 terms in conjunction with the previous ...
n/a = nonapplicable; SD = standard deviation; CV = coefficient of variation (SD/mean × 100); mRR = mean RR interval; SDNN = standard deviation of normal-to-normal intervals; rMSSD = root mean square ...
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